Finding a compatible third party modem is very extremely difficult, especially for a bonded connection. You can easily plug your router into one of the gigabit LAN ports on the T3200 though. I've done that before without noticing any issues. If you have Optik TV you will want to still run the Optik boxes direct to the T3200.
Your DSL is limited by TELUS on their end. If you do not have a good connection and your speeds are slow, it is most likely related to line issues.
Do a speed test and see if you are getting the speed you are paying for. Do this with your computer plugged directly into the modem using a cable if possible. All other devices off if possible.
Learn to troubleshoot your settings. Log into your modem and check your Status.
Check the Line 1 and Line 2 status to see what your error rates are (FEC) This should be low. Mine are over 150 which is very bad.
Check the SNR.
SN Margin (AKA Signal to Noise Margin or Signal to Noise Ratio)
Relative strength of the DSL signal to Noise ratio. 6dB is generally the lowest dB manufactures specify in order for the modem to be able to synch. In some instances interleaving can help raise the noise margin to an acceptable level. Generally speaking, as overall bandwidth increases, your signal to noise ratio decreases. So a customer that upgrades from 1.5 to 6.0 service will typically see a corresponding decrease in the signal to noise ratio. The higher the number the better for this measurement.
6dB or below is bad and will experience no synch or intermittent synch problems
7dB-10dB is fair but does not leave much room for variances in conditions
11dB-20dB is good with no synch problems
20dB-28dB is excellent
29dB or above is outstanding
Check your Attenuation:
Measure of how much the signal has degraded between the DSLAM and the modem. Maximum signal loss recommendation is usually about 60dB. One of the biggest factors affecting line attenuation is distance from the DSLAM. Generally speaking, bigger distances mean higher attenuation. The lower the dB the better for this measurement.
20dB and below is outstanding
20dB-30dB is excellent
30dB-40dB is very good
40dB-50dB is good
50dB-60dB is poor and may experience connectivity issues
60dB or above is bad and will experience connectivity issues
Even the modem manufacturer of the T3200M states that the attenuation should not be over 40dB. So, if you are having issues with any of these, then even changing your modem will not fix the issue. If you get a tech out to fix the problem. Test it yourself before they leave and check the SNR and Attenuation.